Abijah johnson



' uith gisten" atat @Hire ARIJH JOHNSON, OF WEST NEWTON, INDIANA. amJef/am No. 64,328, daad/177m ist?.

STRIKING-ATTAGHMENT TO CLOCKS.

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- TO LL WHOM IT MAY CONCERN:

Be it known that I, ABIJAIIYJOIINSON, of West Newton, in the county ofMarion, and State ot indiana, have invented a new and useful improvementin clocks, which I have called a Teaehers Monitor' and I do herebydeclare that the following is a full and' exact description thereof,reference being had to the accompanying drawing, making part of thisspecifica-tion.

My invention relates to indicating.,r and announcing the programme ofexercises or commencement of recitation of the several classes duringthe hours'ot` school, and to this end consists in substituting for thehour-- hand or" a clock having striking-mechanism a at ring, which isspaced and figured similar to but in the reverse direction from theclock-dial, said ring-'being perforated with small holes in which toinsert pegs that operate the striking-mechanism according to theprogramme of exercises as laid down by the teacher, so that no classshall by oversight be allowed to occupyvmore than its allotted time,that each may receive its due share of attention, and that the schoolmay be conducted with system and order.

"Figure 1 is an elevation et' a clock-face or front with my improvementattached.

Figure 2 is a vertical transverse section through the centre of theclock.

Figure 3 is a representation of the wheels and levers of thestriking-machinery of a clock, showing in red lines the change requiredin the levers so that'the striking-works may be set in operation by myattachment.

My improvement may be attached to any clock having striking-mechanism,but Yin clocks that strike the number of hours the mechanism thateffects this will have to be changed so that the clock .,l strike butone, 'as is common with many clocks now. l

A is the ordinary clock-dial, l) the minute-hand. The hour-hand isremoved, and in its stead a fiat ring, B, is employed, having a centreprovided with a short tube to fit on to the hand-post as the hour-handis attached. From the centre arms radiate to the ring to support andcarry it. On the arm under the l2 the hour-hand may be painted, andwillxindica-te the hours in the usual manner. The ring B is spaced andfigured similar to the dial, but in the reverse direction. The ringl isperforated with small holes, in this case five minutes apart, ortwelvebetween the hours, as shown in g. l, in which to insert pins totrip the striking-wire 'and operate the-striking-machinery. In clocksthat strike the hours the striking-works are set in motion by the leveror striking-wire F, tig. 3, being actuated by the little pin or bentwireg in the hand-*post once in each revolution of the post, being onceanhour.

In order to apply my improvement and cause the clock to strike at thetime set for the commencemen. of the several exercises, all that isrequired is to bendY the lever or striking-wire F, hg. 3, upward, andbend the point outward, as shown at E, figs. 2 and 3, so that it may beactuated by the pins C in the ring B. These pins trip the lever E andset the strikingworks in motion inthe same manner as the pin or bentwire g in the hand-post, and will cause the clock to strike as often asa pin, C, is carried by the revolution of ring B up to Ytrip the leverE. The teacher may commence his exercises at any desired hour, and timehis programme at pleasure, and by inserting:r pins C in the holes inring B cause the clock to announce the same without further trouble orattention. Suppose the exercises to commence at nine oclock, a pin, O,inserted at that figure will cause the clock -to strike at that hour. lfthis exercise is to take up fteen minutes of the time, and another vtocommence at its expiration, alpin inserted in the third hole vin ring B,toward the 10, from the first, will cause the clock to strike as before,and so on'until the time allotted to the several exercises has. expired.When the teacher has once arranged his programme and set the pinsaccordingly, no other attention islrequired than to keep the-clock woundup until he desires to make a change. Although I have shown the holesspaced tive minutes apart, as bein snieient for practical purposes, anyother spacing may be used that is desired- I claim the ring B, spacedand gured as shown, and perforated for` the insertion of pins to operatethe striking-machinery of" a clock. and in combination therewith themovable pins C, substantially as and for the.

purpose set forth.

ABIJAH JOHNSON.

Witnesses WM. H.I Wenns,

G. M. Luvnrra.

